问题补充：
— What impresses you most about your hometown?
— The street, the length of which is four times it was eight years ago．
A. that
B. as
C. than
D. what
答案：
A. that
B. as
C. than
(答案→)D. what
解析：考查倍数表达法。倍数表达法的句式有：①“……times+what+从句”。如：The production is now three times what it was ten years ago. 现在的产量比十年前增加了两倍。②“ …… times+more+名词（可数或不可数）+than+被比对象”。如：There are five times more books in our library than in yours. 我们图书馆里的书比你们图书馆多四倍。③A+倍数+形容词或副词的比较级+than+B”，表示“A比B大（长、高、宽等）多少倍”。如：This rope is twice longer than that one. 这根绳子是那根绳子的两倍长（比那根绳子长一倍）。④.“A+倍数+as+形容词或副词的原级+as+B”，表示“A正好是B的多少倍”。如：Asia is four times as large as Europe. 亚洲的面积是欧洲的四倍。⑤“A+倍数+the size/height/length/width， etc+of+B”，表示“A正好是B的多少倍”。如：This street is four times the length of that one. 这条街是那条街的四倍长。由于题干后it was缺少表语，故选D。
